Added: database_type to configuration

lib/closure_tree/configuration.rb

@@ -1,6 +1,7 @@
 module ClosureTree
   class Configuration # :nodoc:
     attr_accessor :database_less
+    attr_accessor :database_type
 
     def initialize
       @database_less = ENV['DATABASE_URL'].to_s.include?('//user:[email protected]/')

lib/closure_tree/numeric_order_support.rb

@@ -12,6 +12,17 @@ def self.adapter_for_connection(connection)
       end
     end
 
+    def self.adapter_for_database_type(database_type)
+      case database_type
+      when :postgresql
+        ::ClosureTree::NumericOrderSupport::PostgreSQLAdapter
+      when :mysql
+        ::ClosureTree::NumericOrderSupport::MysqlAdapter
+      else
+        ::ClosureTree::NumericOrderSupport::GenericAdapter
+      end
+    end
+
     module MysqlAdapter
       def reorder_with_parent_id(parent_id, minimum_sort_order_value = nil)
         return if parent_id.nil? && dont_order_roots

lib/closure_tree/support.rb

@@ -27,7 +27,11 @@ def initialize(model_class, options)
       }.merge(options)
       raise ArgumentError, "name_column can't be 'path'" if options[:name_column] == 'path'
       if order_is_numeric?
-        extend NumericOrderSupport.adapter_for_connection(connection)
+        if ClosureTree.configuration.database_type
+          extend NumericOrderSupport.adapter_for_database_type(ClosureTree.configuration.database_type)
+        else
+          extend NumericOrderSupport.adapter_for_connection(connection)
+        end
       end
     end